I've put RPMs of samba-3.0.2rc1 on
http://people.redhat.com/fenlason/.samba . Can you try them and see if
they resolve your problem. Note that these are un-qa'd packages of a
release that is not intended for production use. If they solve your
problem, I will attempt to get samba-3.0.2 included in the next quarterly
update of Red Hat Enterprise Linux 3.